The ATLAS Detector: Performance Results

The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider at CERN. During the Run 1 data taking, the ATLAS trigger and data acquisition system has been used to collect a large data sample useful for a wide variety of physics analyses. The 2012 run saw both larger luminosity and larger number of simultaneous interactions than in 2011, challenging the trigger system, objects reconstruction and physics analyses. The efficient reconstruction and identification of the different leptons, b−quark jets and missing transverse energy played a key role in the different analyses, leading to the discovery of the Higgs boson in July 2012.